Octagonal numbers for which both the sum and the product of the digits is also an octagonal number.

Terms

a(0) =0a(1) =1a(2) =8a(3) =1160a(4) =20501a(5) =30401a(6) =42960a(7) =90480a(8) =131880a(9) =168033a(10) =181056a(11) =208560a(12) =238008a(13) =269400a(14) =302736a(15) =338016a(16) =375240a(17) =414408a(18) =455520a(19) =520833a(20) =590520a(21) =690240a(22) =743016a(23) =770133a(24) =854400a(25) =913008a(26) =943041a(27) =1004565a(28) =1036056a(29) =1068033